初一的英语题！！！

一、第一句是系表结构的，但after graduation在句是做时间状语。

二、在her main job was to look after the children.中，也是系表结构，表语是动词不定式短语to look after the children。在这个不定式短语中，the children做look after的宾语。

三、第三句你说的很是的确是介词短语on the table做表语。

after graduation是时间状语，与I will do my work in the evening中的in the evening一样，意思是在毕业以后，她成为了一名教师
look after是一个短语，意思是照顾，相当于一个及物动词，所以the children是look after的宾语，他的工作所照顾的对象是孩子
on the tabel式表语，它是一个介词短语

1.she became a teacher after graduation.
after graduation.是状语.
2.her main job was to look after the children
the children也是宾语
3.the book is on the table.
on the table是介词做表语.

after graduation 时间状语
the children 宾语
对on the table 做表语